【作者】 史庭祥；

【导师】 宋茂忠；

【作者基本信息】 南京航空航天大学 ， 通信与信息系统， 2003， 硕士

【摘要】 为解决未来通信系统中的通信定位综合化问题，以及提高时空调制扩频通信定位系统抗多径测角测距性能，本文分析系统在多径环境下的信号接收，分别研究基于DLL环的伪码跟踪技术和码片内多径分离技术。 对于伪码跟踪技术，给出一种开环补偿方法和多环迭代算法。在码片内多径分离技术方面，先分析码片内多径分离的可能性，后通过化为线性方程组的办法给出一种简单的分离方法，并分析伪码跟踪误差对分离结果的影响，最后基于信道冲激响应估计和提出的多径分量提取算法，给出伪码跟踪误差和多径分量的联合估计，并应用于圆天线阵时空调制扩频通信定位系统，仿真结果表明，明显改善了系统的测角测距性能。更多还原

【Abstract】 To meet the challenge of future communication and integrated communication and radiolocation system, it is analyzed that how to receive space-time signal and obtain location information under multi-path environment in a spread-spectrum space-time modulation system, which is an integrated communication and radiolocation system with circular array antenna. Two techniques of pseudo-random code tracking relying on delay lock loop (DLL) and separation of sub-chip multi-path components are studied as follows.According to the first technique, the expression of open-loop measurement compensation and a new multi-loop iteration algorithm are deduced based on previous research, and the following research on the second technique consists of several parts. First, a simple method is proposed suitable for separation of sub-chip multi-path component and the influence of tracking errors on the separation of sub-chip multi-path components under spread-spectrum communication model is discussed in detail, then some certain researches on joint-estimation of pseudo-random code tracking and sub-chip multi-path components are carried out, which combine a simple new algorithm for extracting multi-path components and a sort of estimation of multi-path channel pulse response in presence of multi-path interference. Finally, this kind of joint-estimation is applied to the system, and the results of the simulation demonstrate that the accuracy of direction-finding and ranging is improved after adopting the method.更多还原